Numbers 9:6 provides the background: men defiled by a dead body could not keep Passover, prompting the inquiry that God answers here.

Numbers 9:7 records the men's complaint about being excluded, which directly leads to God's provision in this verse.

Numbers 19:11 defines uncleanness from touching a dead body, the specific cause mentioned here for delaying Passover.

In 2 Chronicles 30:2, Hezekiah applies this provision by moving Passover to the second month for those unable to keep it in the first.

2 Chronicles 30:18 shows people eating Passover while still unclean, contrasting with the law's requirement to delay until clean.

Ezra 6:21 describes post-exilic Passover observance, including those who separated from filthiness, a later application of the purity provision.